Anything with string spacing smaller than 19mm / 3/4".
It's just horrible! The horror, the horror...
Oh I can play and have played smaller spacings, and still got all the sounds I wanted from the bass. But doesn't mean I liked it. Because I didn't. Not at all.
Also, anything with low output. I want basses (active or passive) to put out a nice juicy signal. I care less if the tone's ugly then I do about having to strip my fingertips to the bone because the thing just won't speak up!!

Few weeks back I would've said anything with a huge thick neck, but I picked up double bass recently so all bass guitars feel small and light to me now!

I'm not very picky, none of the ibanez line really appeals to me besides some of the BTBs, but I wouldn't mind playing one if it comes down to it, hmm... Musicman 5 I could live with but rather not play, and maybe a poorly designed wish. Oh I didn't elaborate on why the Musicman 5, its cause of the tight string spacing turns me off. Which is why I could live with it I guess if I got used to it, but rather not.

No, I actually love laklands, its the fact that the man who created laklands LOVED Fender and Musicman, and molded the two to get a Lakland... Thats why its strange, But it feels VERY different in my hands... The sound, The Feel of the neck, Is Totally different... I find the Fender and Musicman necks to be total Pieces of Crap, that I despise more than the youth of america...